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Thin films of undoped Nickel oxide and fluorine doped Nickel oxide have been deposited utilizing easy and cheapest technique, which is chemical spray pyrolysis. Absorbance and transmittance spectra were achieved by double beam spectrophotometer in the wavelength range (300-900) nm. Direct electronic transition for the deposited films, the optical energy gap was evaluated to be increase as the doping ratio increase. All the optical constants such as reflectance and refractive index, are affected by increase their value with the increase in F content. The calculated skin depth was found to decrease upon the increase of fluorine.